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RIS improves quadrature spatial modulation efficiency

Published on:

30 November 2023

Primary Category:

Information Theory

Paper Authors:

Mohamad H. Dinan,

Mark F. Flanagan

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Key Details

Proposes RIS-GRQSM which generalizes prior RIS quadrature spatial modulation schemes

Activates multiple receiver antennas independently for in-phase and quadrature signals

Defines optimization to adjust RIS phase shifts, maximizing SNRs at active antennas

With each antenna as separate user, enables practical high-performance RIS multicasting

Demonstrates substantially improved error rate over benchmark schemes

AI generated summary

RIS improves quadrature spatial modulation efficiency

This paper proposes an intelligent surface (RIS) system called RIS-assisted generalized receive quadrature spatial modulation (RIS-GRQSM). It activates multiple receiver antennas independently for in-phase and quadrature signals to improve spectral efficiency of existing RIS quadrature spatial modulation systems. A optimization method adjusts RIS phase shifts to maximize signal-to-noise ratios at active antennas. Compared to prior work, the proposed technique reduces optimization complexity and improves error performance significantly, especially for larger receiver antenna numbers. With each antenna corresponding to a separate user, this enables a practical, high-performance RIS multicast system.

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